<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>特殊场景this绑定实验</title>
</head>
<body>
    <button>按钮</button>
    <script>
        setTimeout(function() {
            console.log("定时器函数", this);
        },1000);
        var btnE1 = document.querySelector("button");

        btnE1.onclick = function() {
            console.log("btn的点击 (onclick) :", this);
        };

        btnE1.addEventListener("click", function() {
            console.log("btn的点击 (addEventListener) :", this);
        });
        var names = ["abc", "cba", "nba"];
        names.forEach(function(item) {
            console.log("forEach:", this);
        }, "aaaa");
    </script>
</body>
</html>